Bobbin-holding device for lock-stitch sewing-machines.



'J. E. THAYER. BOBBIN HOLDING DEVICE FOR LOCK STITCH SEWING MACHINES. AIPLIUATION FILED FEB. 15, 1905.

' ,1,024=,708.- Patented Apr.30, 1912.

UNITED STATES PATENT oFFroE.

JOSEPH E. THAVYER, or EAST aninenwarnn, MassAcn snrms, s'smmt To UNITED snon MACHINERY COMPANY, or rii'rnnson, NEW JEnsEY, ,AHCOBPJORATIQN" or NEW J ERSEY. T

BbBBIN-HQLDING DEVICE non megaw tteawnvamcsmEs-r t Specification of Letters Patent. APT. 30, Application filed February 15, 1905. Serial No. 245,697.

To all whom it may concern: I

Be it known that I, JOSEPH E. THAYER, a citizen of the United States, residing at East Bridgewater, in the county of Plymouth and State of Massachusetts, have invented certain new and useful Improvements in Bobbin-Holding'Devices for Lock- Stitch Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to an improvement in bobbin holders for lock stitch sewing machines.

In the Goodyear Rapid stitcher, which is illustrated with substantial accuracy in the patent to French and Meyer, No. 47 3,870, the bobbin case, or bobbin, as the bobbin and bobbin case are: generally referred to, is placed loosely in the oscillating shuttle and held there during the operation of the machine by abobbin holding arm which engages the face of the bobbin and preventsits displacement. [F or convenience in removing and leplacing'the bobbin the bobbin holding arm is pivoted to a bolt supported in a bracket projected from the side of the shuttle race. By tightening the nut on the bolt the bobbin holding arm is frictionally held in place. A leather washer under the nut is relied upon to create the necessary friction to hold the bobbin arm from displacement in the operation of the machine. See patent to French and Meyer, No. 424,966. Inthis construction the bobbin holding arm is held in place solely by frictional means, and those means have been found ineffective owing to the fact that in the operation of the machine the jar of the parts, and particularly the jar of the bobbin against the bobbin holder, tends to loosen the nut which holds the bobbin holding arm in place. It has also been proposed in a lock stitch sewing machine to hold the bobbin holding arm in place by a T-heade'd bolt which passed through a slot in'the bobbin holding arm and was then turned to engage and hold the bobbin holding arm in place.

In this construction, however, this bolt was still more liable to be turned in the operation of the machine into the position to release the bobbin' holding arm.

' 'In the, accompanying drawings illus- The object of the present invention is to produce an improved construction of bobbin holdln means in which the bobbin arm is positive y held in place, that is, held in place so that it cannot become loosened ordevices hereinafter described and particularly defined in the claims.

trating the preferred form of the invention Figure]. is a front elevation of the shuttle race and bobbin holding means, and Fig.

2 is a plan of the same, the parts being shown as adapted to be incorporated in the machine of the said French and Meyer Patent No. 473,870 to which for a description of the parts not hereinafter mentioned reference may be had.

The shuttle racel, adapted to receive the shuttle and the bobbin therein, is substantially the same as in said patented machine. The bobbin holding arm 2 is pivoted upon the bolt 3 which is carried by .a bracket 4 secured to the head of the machine. c axis of movement of the bobbin holding arm is vertical so that the bobbin holding arm moves toward and from the bobbiru.

the shuttle arm in operative positiomwhich latch is pivoted upon the cap bolt 7 which screws into the bracket4. The axis of the bolt 7 is arranged at right angles to the axis of movement of the bobbin arm and parallel to the axis of the shuttle movement. Then the latch 6 occupies the position illustrated by full lines in Fig. 1 it positively holds the shuttle arm from swinging upon its support away from the bobbin by the engagement of an adjusting screw 8, located in the end of the latch with the bobbin arm. The screw 8 is provided with a set nut by means of which the screw is locked in place against accidental displacement by the jar of the machine. When the bobbin holding arm is adjusted by means of the screw 5, to swing farther in the adjust- Iing screw 8 must be correspondingly adjusted and vice versa.

The latch 6 is normally held in its locking position by means of a spring-pressed pin 9 which is supported in a hole 1n the? bracket L and adapted .to slide back and forth therein to engage a recess 10 in the face of the latch 6. When the latch 00.- cupies the position shownby the full lines in Fig. 1, the spring-pressed pin 9 is in engagement-with the recess 10 and yieldingly holds the'latch 6 from beingmoved from such position. A screw 11 is ,provided for limiting the movement of the springpressed pin 9. By turning the latch 6 to the position illustrated in dotted lines in said figure the latch is disengaged from the bobbin holding arm 2 and the arm may be swung outwardly to permit removal and replacement of the bobbin in the shuttle. This construction aifords eflicient means forpo'sitively holding the bobbin holding arm in operative position without liability of accidentalidisplacement, the latch 6 aifording a positive support for holding the bobbin holding arm from displacement.

The invention is applicable to different forms. of lockstitch sewing machines, and may be embodied in other forms thanthat illustrated in the drawing and described 40 holding arm in operative position, said latch being provided with an adjusting screw by means of whiph the position of the surface of engagement with the bobbin holding arm may be determined, substantially as described. 1

2. A lock-stitch sewing machine, having, in combination, a bobbin, a bobbin holding arm pivotally mounted to swing toward and from the bobbin, an adjustable stop to determine the operative position ofsaid arm and a latch constructed to engage and positively hold the bobbin holding arm in operative position, said latch being provided with an adjustable screw by means of which the position of the surface of engagement with the bobbin holding arm may be determined, substantially as described.

3. A lock stitch sewing machine, having, in combination, a bobbin, a bobbin holding arm pivotally mounted to swing toward and from the bobbin, a latch constructed to engage and positively hold the bobbin holding arm in operative posit-ion and a spring pressed locking device movable into and out of locking position to hold the latch in en-- gagement with the bobbin holding arm, substantially as described.

a. A look stitch sewing machine, having,

in combination, a bobbin, a bobbin holding arm pivotally mounted at one side of the bobbin to swing toward and from the bobbin, and. a latch constructed to engage the bobbin holding arm on the same side of the pivot as the bobbin and hold the bobbin holding arm in operative position, said latch being pivotally mounted upon a pivot having its axis at right angles to the axis of the bobbin holding arm and being arranged to engage the surface of the arm away from the bobbin, substantially as described.

5. A look stitch sewing machine, having, in combination, a bobbin, a bobbin holding arm pivotally mounted to swing toward and from the bobbin,-a latch pivotally mounted upon a pivot having its axis at right angles to the axis of the bobbin holding arm, and a spring pressed locking device to engage the latch when the latch is in posit-ion to engage and hold the bobbin holding arm in operative position, substantially as described.

In testimony whereof I affix my signature, in presence of two witnesses. JOSEPH E. THAYER. Witnesses:

Homer. VAN Evnrnn, FRED O. Frsn. 

